https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 15 Apr 2026 06:31:37 +0000 Sat, 27 Jul 2019 02:09:52 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=12019 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=12019&PID=65629&title=taichi-x470-bios-3-50-usb-regression#65629 Author: goertzenator
Subject: 12019
Posted: 27 Jul 2019 at 2:09am

After installing the 3.50 BIOS update I immediately experience severe USB problems:

On ports USB5, USB6, USB32_TA_1, and USB3_9_10 devices connected through a hub experience a reset every few seconds. Details:
- This is observed in both Linux and Windows.
- This was observed using the hub built into my Dell U3417W, a Plugable 2.0 4-port hub, and a cascade of the 2.
- Devices work correctly when plugged directly into the USB ports (ie no hubs). Confirmed under linux, but not Windows.
- This worked correctly BIOS 3.46, so this seems to be a regression.
- USB1-4 still work correctly. Other mobo and USB-C port not tested.
- CPU is a 3900x.

Additionally the IOMMU groups got "worse". Both my video cards are now in the same group.
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